Mechanical device for receiving sand and discharging it therefrom under pressure.



No". 734,773. I PATENTED JULY 28,1903.

- WgH. STUART.

MECHANICAL DEVICE FOR RECEIVING SAN-D AND DISGHARGING IT THEREPROM UNDERPRESSURE. APPLIoATIbN FILED JULY 26. 1902.

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a UNITED STATES Patented. July 28, 1903,

PATENT OFFICE,

ILLIAM HENRY STUART, OE BALTIMORE, MARYLAND, ASSIGNOR To CONOMYLOCOMQTIVE SANDER COMPANY, OF BALTIMORE, MARY- LAND, A CORPORATION OFDELAWARE.

MECHANICAL DEVICE FOR RECEIVING SAND AND DISCHARGING lT THEREFROM UNDERPRESSURE.

SPECIFICATION forming partof Letters Patent N 0. 734,773, dated July 28,1903.

Application filed July 26, 1902.

$e1'ial No, 117,213. (No model.)

' of this specification.

current of steam or other fluid pressure.

My invention relates to mechanical devices used in the arts andindustries, having inclosed chambers and discharge-passages into whichsand or other finely-comminuted substance is introduced at or abovenormal pressure and from which it is discharged by a Insuch devices thetendency of the sand (which carries more or less moisture) to clog thepassages, to oxidize or rust the inner walls of such passages, andtherefore more quickly clog them as well as destroy them, the tendencyof the normally rough surface of such walls to create frictionalresistance to a moving body of sand, and, finally, the tendency of thesharp sand to out the metal of surfaces with which it makes frictionalcontact are disadvantages well known to users of all such devices.

The object of my invention is to overcome these defects by the provisionof suitable means to that end; and my invention consists broadly inproviding the inner walls of the valvular and other sand-passages ofsuch devices with a substantially smooth and nonoxidizablesurface,,whereby the clogging of such passages from accumulatedcorrosive oxidation resulting from the damp sand will be entirelyobviated and the life and utility of the device prolonged and increased;also,

in providing a particularcharacter of such non-oxidizablesurface-namely, a coating or plating such as produced bygalvanizingwhich is so smooth as to be slippery in the sense of beingincapable of producing perceptible frictional resistance, in order thatthe natural tendency of the moving body of sand to create frictionalresistance against the walls applicable to other devices in the arts inA which sand or finely-comminuted mineral matter is received anddischarged through closed tubular or other passages therein.

Practically applied to either of the devices shown in the drawings theinner walls of the cast-metal sand-receiving chamber and its tubulardischarge-passages leading there from are preferably first cleaned byany known means for cleaning the surfaces of castings, and then suchsurfaces are to be galvanized by any known means for galvanizing suchmetallic surfaces. It is obvious, however, thatin lieu of galvanizingthe inner wan-su faces of the said passages may be coated or lined withor made of any known antifriction and non-oxidizable coating capable ofbeing attached to metal or they may be electroplated or otherwiseprovided with a metallicor other deposit commonly applied in the otherarts to metallic surfaces in any wellknown way to impart thoseproperties and functions to such metallic "surfaces; but I have foundthat galvanizing, especially if the surface be preliminarily cleaned andsmoothed, as stated, will be found to be the most efficient andeconomical.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. A sand-delivery device containing sandreceiving and discharging passages in and through which a body of sandor other finely comminuted mineral substance is introduced underatmospheric or higher pressure and discharged therefrom byfluid-pressure, said,

passages having their inner walls providec with a substantially smoothand non-oxidizable surface; substantially as and for the purposes setforth.

2. A device for receiving a body of sand and discharging it therefromunder fluid-pressure, the inner Walls of the sand-passages having asubstantially smooth and non oxidizable surface, which is slippery inthe sense of being incapable of creating perceptible frictionalresistance to a body of sand moving through said passages underfluid-pressure; substantially as described.

3. A device for receiving a body of sand and discharging it therefromunder fluid-pressure,

having tubular and other sand passages the walls of which have beenpreliminarily deprived of normal roughness by known means, and havingsuperposed thereon a smooth and non oxidizable galvanizedsurfacecoating; substantially as described.

In testimony whereof I have hereunto affixed my signature this 24th dayof July, A. 1).1902.

WILLIAM HENRY STUART.

Witnesses:

MILLARD LEONARD, JOHN S. BRIDGES.

